Summary: Last class, students were introduced to genetics and looked at dominant and recessive traits that they have. Today we will look at their list of dominant/recessive traits. Students will work in pairs and determine the traits their offspring will have. Then we will start looking at Punnett squares and what they are/do, and this will be introduced with a Coin Flip activity. Students will practice with examples of Punnett squares and determine the probability of their offspring having certain traits through Punnett Squares. This will help students better understand the work of Mendel that will be discussed next class.
Objective: The student will review their dominant and recessive traits list. The student will compute Punnett Squares for their offspring.
Materials:
Coin Flip activity (worksheet, coins)
Punnett squares worksheet
Instruction: Opening
- What was the main idea of the traits inventory list?
- What is a trait? Is there any way we can determine the chance of our kids getting that trait?
Activites
1. Review traits and go over inventory list
Students can discuss in pairs, then in whole group what they found
Take the traits they have come up with and pair up with another student
If you were to create an offspring, what traits will you pass on? Why?
What are possible student answers to these questions and how will you respond? Will you explain the concepts of dominance and recessive now or later?
Have students work in pairs to determine the results
Questions for students to think about and answer:
Which combination happened most often?
If you tossed both coins one more time, which combination would be the most likely result?
Can you know for sure? Why?
Will you have an example trait for the coins like hair or eye color or will you just use head/tails comination? When do the students learn about homozygous/heterozygous?
3. Punnett Squares notes and examples
Genotype vs. Phenotype (what are they? what do they describe?)
Students will work on Punnett Squares as a class, then by themselves/in small groups
Summary:
Last class, students were introduced to genetics and looked at dominant and recessive traits that they have. Today we will look at their list of dominant/recessive traits. Students will work in pairs and determine the traits their offspring will have. Then we will start looking at Punnett squares and what they are/do, and this will be introduced with a Coin Flip activity. Students will practice with examples of Punnett squares and determine the probability of their offspring having certain traits through Punnett Squares. This will help students better understand the work of Mendel that will be discussed next class.
Objective:
The student will review their dominant and recessive traits list.
The student will compute Punnett Squares for their offspring.
Materials:
Instruction:
Opening
- What was the main idea of the traits inventory list?
- What is a trait? Is there any way we can determine the chance of our kids getting that trait?
Activites
1. Review traits and go over inventory list
- Students can discuss in pairs, then in whole group what they found
- Take the traits they have come up with and pair up with another student
- If you were to create an offspring, what traits will you pass on? Why?
What are possible student answers to these questions and how will you respond? Will you explain the concepts of dominance and recessive now or later?2. Coin Flip activity
- Purpose- determining probabilities
Wong_CoinFlipActivity.doc
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- Have students work in pairs to determine the results
- Questions for students to think about and answer:
- Which combination happened most often?
- If you tossed both coins one more time, which combination would be the most likely result?
- Can you know for sure? Why?
Will you have an example trait for the coins like hair or eye color or will you just use head/tails comination? When do the students learn about homozygous/heterozygous?3. Punnett Squares notes and examples
Closing
- How can Punnett Squares be applied to the real world? To your life?
Notes:
Next class, go over Mendel's work, and introduce Pedigree activity.